Ratchet Buckle Clasp is an ideal Wetsuit watch band buckle. The ratchet theory extension mechanism is of great importance for both convenience and safety. Super Engineer II watch bracelet is composed by 5 chamfer edge well-made solid 316L stainless steel units. Screw-in adjustable details instead of flimsy pins to keep its solidity and stability. This item includes one pair of FAT spring bar (eg. generic Seiko Dia. 2.5mm spring bar) to ensure a more secure connection. Super Engineer II Series is a good choice of replacement watch band for your diving or military big watches.